I recommend dental floss.

This is the dental floss I've been using since I was a student. At first, I just bought it from a pharmacy and used it without much thought, but after trying a different floss and realizing, "Ah, this is the real deal," I've been using only this product ever since. First off, the thread is coated with wax, so it seems more hygienic and likely causes less damage to my teeth and gums. The thread is also sturdy and doesn't break easily, and it comes in a generous 50 meters. If you're a floss nomad looking for the perfect product, I highly recommend settling down here!